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Development and Field Application of Portable Tensioning System Using Segmental CFT Member
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 Title & Authors
Development and Field Application of Portable Tensioning System Using Segmental CFT Member
Lee, Doo Sung; Kim, Tae Kyun; Lee, Sung Chul;
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 Abstract
Pretension PSC (Prestressed Concrete) members are subjected to a certain limit of size as they are generally produced in the off-site plant and transferred to the site due to the large scale of the product on system. In this study, a portable pretensioning production system has been developed, which allow us to apply the pretension method on site. Considering that a 50m span PSC girder using the pretension method requires a pressing device to endure a large jacking force, the portable pretension production system has to ensure safety against such a large pretension jacking force. In this study, the portable pretensioning system to produce a 50m span pretension girder was manufactured by using CFT (Concrete Filled steel Tube) members. In order to understand the stability of the system and the behavior of the elements, a static loading test was conducted and the stability of the proposed portable pretensioning production system was confirmed. The developed portable pretension system was applied to several construction sites and was investigated the problems on site. During the pretension girder and slab members that was producted by this pretension system in construction site, it has be found the several advantages such as simple fabrication processes, reduction of prestress-loss, and a decrease of 15% compared with the fabrcation cost of post-tension girder. After due consideration of the problems, this portable pretension system will be improved.
 Keywords
Pretension method;Transportable tensioning system;CFT member;Field test;Constructability;
 Language
Korean
 Cited by
1.
노출강연선으로 보강된 하이브리드 건축용 OCB보의 실물모형 재하실험연구,이두성;김태균;채규봉;

한국콘크리트학회논문집, 2015. vol.27. 5, pp.471-480 crossref(new window)
1.
The Experimental Study of Full-scale Optimized Composite Beam (OCB) Reinforced with Open Strands, Journal of the Korea Concrete Institute, 2015, 27, 5, 471  crossref(new windwow)
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